Extended Data Fig. 2: Summary of state-of-the-art QKD and QKD networks without trusted intermediate nodes.
From: Large-scale quantum communication networks with integrated photonics
The size of points in the visualization represents the total quantum networking capability. In the TF-QKD network presented in this work, we achieved a total quantum networking capability of NL/2 = 3,700 km, with N = 20 chip-based QKD users and L = 370 km channel distance. Some notable demonstrations of QKD and QKD networks include: the longest satellite-based QKD in ref. 61; the longest fibre-based TF-QKD in ref. 19; deployed TF-QKD in ref. 21; the longest MDI-QKD in ref. 62; the longest chip-based MDI QKD in ref. 39; a three-user MDI-QKD network in ref. 63. Results from QKD networks relying on trusted intermediate nodes are excluded from this summary.
